Pebble or ball mill.



E. P. DARGIN.

PEBBLE 0R BALL MILL. APPLICATION FILED mums, 1910.

Patented Jan. 17, 1911.

INVENTOR.

IVITNESSES: 1

- I I I EPDa /h E. P. DARGIN. PEBBLE 0B. BALL MILL. APPLICATION rum) 123.23, 1910.

981,983, Patented Jan. 17,1911.

2 SEBET8SHEET 2,

927' a 2/ a Olga/a o 7/4 22 a o o "a /4 o o 6 /5 f v Q 0$ WITNESSES: LVVENTOR.

ERNEST P. DARGIN, OF DENVER, COLORADO.

PEBBLE on BALL MILL.

Specification of Letters Patent.

Patented Jan. 17, 1911.

AppIication filed'Fe'oruary 23, 1910. Serial No. 545,321.

15 and 16 which when the parts are as; e

To all whom it may concern:

Be it known that I, ERNEST P. DARGIN, a citizen of the United States of America, residin at Denver in the county of Denver and gtate of Colorado, have invented certain new and useful Improvements in Pebble or Ball Mills, of which the following is a specification.

This invention relates to new and useful improvements in pebble orball mills and it has for its object the provision of a machine of simple construction in which comminuible substances such as clay or ore, may be speedily ground to a desired fineness by attrition with a mass of balls or pebbles contained in a rotating receptacle. I attain this object by the mechanism illustrated in the accompanyin drawings in the various views of which hie parts are similarly designated and in whic Figure 1, represents a partly sectional elevation of the improved mill and Fig. 2, a transverse section taken along the line 2-2 Fig. 1.

Referring to the drawings by numerical reference characters let the numeral 2 designate a supporting structure or frame preferably composed of upright and transverse timbers rigidly connected by the judicious application of braces and stay-bolts. An upright, partly tubular shaft 3 provided at its lower extremity with a shoe 4, is rotatably supported upon conical anti-friction rollers 5 in a step-box 6 which is firmly secured at the basal portion of the structure 2.

concentrically mounted upon the shaft 3 to rotate in unison therewith, is a receptacle 7 made up of a circumferentially flanged bottom section 8 which is connected with the shaft by keys or other suitable fastening means, an inverted conoidal body section 9 supported uponthe bottom section, and a top or cover-section 10 which is secured upon the upper end of the body portion and is composed of a central tubular-duct 12 through which in practice the comminuted matter is discharged from the receptacle, and a surrounding annular roof 13, arched in cross section whose intrados forms a continuation of the interior surface of the body ortion. f

Both the body section 9 and the annular portion of the cover 10 are composed of sheet metal stiffened by exteriorly applied teeshaped ribs 14 and their adjoining circular edges are provided with surrounding flanges 'sembled, are secured together by means of bolts 17 The tubular portion of the shaft 3 extending from the bottom of the receptacle 7 beyond the top of the supporting structure, is fitted in a sleeve 18, the upper extremity of which terminates in a hopper 19 into which the substance to be treated is fed through a conduit 20.-

The tubularportion 12 of the cover 10 which projects from the inner edge of the annular portion 13, beyond the top thereof, is spaced from the circumferential surface of the sleeve 18 and is connected by means of apertured partitions 21, with a concentric core 22 which closely surrounds the said sleeve. The duct 12 is furthermore provided at its up er extremity, with an innular downwar ly inclined apron 23, which in conjunction with a superposed hood 23, provides a discharge spout 23 the outer portion of which projects mouth of a circular trough idly secured to the frame 24 which is rig- 2 by means of loosely into the suitably constructed brackets 25, and from the bottom portion of which conduits 26 extend downwardly to convey the comminuted matter from the mill into conveniently located receptacles.

The interior surface of the receptacle 7 as well as the portion of the sleeve 18 extending therethrough, are covered with a lining 27 composed of porcelain silex or other suitable material which may be varied in accordance with the character of the substance to be treated.

The tubular shaft has in its circumferential wall a plurality of openings 28 which communicate with the interior of the hopper 19 at its lowermost portion for the passage of the matter discharged thereinto from the conduit 20, into the interior of the shaft 3, and the latter is furthermore formed in its lower portion, contiguous tothe bottom surface of the receptacle, with openings 29'which correspond with similar apertures in'the surrounding sleeve 18 and the lining 27, to introduce the said matter into the mass of pebbles or balls 30 which, as shown in Fig. 1 of the drawings, occupies the lower portion of the receptacle.

The shaft 3 and the therewith connected parts, are rotated through the instrumentality of a pair of beveled gear-wheels 31 and 32 one of which is secured at the upper extremity of the said shaft, while the other hereinbefore explained. During the rotatory movement of the receptacle, the pulpy matter is thoroughly intermixed with the parts 30 which by the centrifugal force produced by the rapid movement of the receptacle, are forciblyprojected against the circumferential, outwardly flaring, interior surface of the body portion of the receptacle, to move upwardly, in the direction of the arrows Fig. 1, along the intrados of the arched member of the cover, until they have passed the vertex thereof when, by gravitational attraction they fall into and through the aqueous matter contained in the upper portion of the receptacle. It will thus be observed that the attrition of the pulpy matter is accomplished by three actions, 1st the abrasive contact of the several balls or pebbles with each other; 2nd their frictional movement along the inner surface of the receptacle and 3rd'their impact with the mass contained in the receptacle when falling" from the upper portion of the cover 10. When the constituents of the slimy or pulpy matter have been reduced to the desired fineness they will,

by reason of their increased buoyancy, rise to the surface of the fluid Whose level is maintained above the upper edge of the duct 12 and the supernatant matter flowing through the spout 23 into the receiver 24 is discharged therefrom through the conduits 26 to becollected in suitable receptacles, It will thus be observed that while the machine is in operation the. aqueous mass fed into the hopper 19 will circulate continuously and that the degree of fineness of the product of the mill, being proportionate to the length of time the material remains within the receptacle, may be regulated by increasing or decreasing the amount fed into the hopper, during a stated. period.

Having thus described my invention what I claim and desire to secure by Letters Patent is I 1". In a mill of the class described, an inclosingreceptacle rotatable about a vertical axis, a mass of comminuting bodies contained therein, means for introducing material into the said mass at the lower portion of the 4 receptacle, and a conduit extending upwardly beyond the top of the said receptacle in communication with its interior, .whereby the upper strata of material rising pulleys 35 and tained therein, and means for introducing beyond the top of the said receptacle, are automatically discharged by overflowing the edge of the said conduit. i

2. In a mill of the class described, an inclosing receptacle rotatable about a vertical axis, an axially disposed discharge conduit extending. upwardly beyond the top thereof, a receiver subjacent the orifice of the said conduit, a spout constructed to conduct matter overflowing the edge of said conduit into the said receiver, a mass of comminuting bodies within the said receptacle, and means for introducing material into the said mass while the receptacle is in motion. 7

3. In a mill of the class described, an up-. right tubular rotatory shaft, a receptacle mounted thereon, a mass of comminuting bodies within, saidreceptacle, and means for introducing material into the interior of the shaft, the said receptacle having an outlet in its upper portion and the said shaft having apertures to discharge the material from its interior into the said mass. a

4. In a mill of the class described, a rotary upright, tubular shaft, a hopper surrounding the same in communication with its interior, a receptacle mounted on the said, shaft 1 said shaft, a stationary trough surrounding said conduit subjacent its mouth, a spout constructed to conduct matter overflowing the edge of the said conduit into the said trough, and a mass of comminutin bodies within the said receptacle, the sa1d shaft having apertures for the discharge of material from its interior into the said mass.

6. In a mill of the class described, an inclosing receptacle rotatable about a vertical axis, a mass of comminuting bodies conmaterial into said mass at the lower portion of the receptacle while it is in motion, the

said receptacle having in its top a central opening through which the upper strata of its contents are discharged.

7. In a mill of the class described, a receptacle rotatable about a vertical axis, a mass of comminuting bodies contained therein and means for introducing material into said while it is in motion, the said receptacle comprising a downwardly tapering circumferential wall and an annular concavetop, whose inner surface is continuous with that mass at the lower portion of the receptacle of said wall and which defines a central receptacle while it is opening through which the upper strata of terior surface is continuous with that of said wall, whereby dur'ng the rotatory movement of the receptacle, its. contents will be im- 15 pelled upwardly'along said wall and along said top to be deflected downwardly toward the bottom of the receptacle.

In testimony whereof I have aflixed my signature in presence of two witnesses.

ERNEST P. DARGIN.

the contents of the receptacle are discharged.

8. In a mill of the class described, a receptacle rotatable about a vertical axis and having a central outlet in its top, a mass of comminuting bodies contained in said receptacle, and means for introducing material into said mass at the lower portion of the in motion, said receptacle comprising a downwardly tapering Witnesses: circumferential wall and a deflective top I G. J. ROLLANDET,

M. L. GEARY.

which surrounds said outlet and whose in- 

